// editor3
# include<stdio.h>
int main()
{
    int n,arr1[],arr2[n],i;
    scanf("%d",&n);
    arr1[5]={1,2,3,4,5};
    for(i=0;i<n;i++);
    scanf("%d",&arr2[i]);
    for(i=0;i<n;i++)
    if(arr1[i]!=arr2[i])
    {
        printf("%d",arr2[i]);
    }
}